three things. first of all they have to treat the injured. then it's control, isolate and negotiate. they have to control the situation, isolate the gunman, and then if there's no one being shot at, they have to institute negotiations. now, contessa, you and i and your listeners have been in huge complexes like this. law enforcement, too, they have to shut off the stairs. they have to shut off the elevators, and with that many people around, there's a potential that should there be a gunman still out there, he or she could have taken one or more hostages. so this is a very trying situation. law enforcement, people that i've trained in hostage negotiations, would try to either talk to them directly or by phone, trying to take the stress and anxiety away, and get this person or persons to the position where they will surrender, where they will release, if they have any, hostages. >> so again the situation that we're seeing right now, that there's a gunman holed up on the eighth floor of johns hopkins hospital. this is baltimore, maryland. the police are there.